Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 8 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/30/2017   22:18:01   (  -0.35,-135.06) (   0.14,-132.84)  252.02                80
 09/01/2017   10:39:50   (   0.34,-135.07) (   1.02,-138.12)  347.81                80
 09/02/2017   10:18:26   (   0.34,-135.05) (   0.04,-133.58)  166.93                80
 09/03/2017   22:40:23   (  -0.34,-135.01) (  -1.22,-138.89)  442.34                80
 09/04/2017   22:24:19   (  -0.34,-135.01) (  -0.18,-134.37)   72.96                80
 09/07/2017   10:27:24   (   0.33,-135.00) (   0.37,-135.11)   12.26                80
 09/09/2017   22:27:57   (  -0.33,-134.92) (  -0.56,-135.88)  109.35                80
 09/10/2017   22:11:54   (  -0.33,-134.91) (   0.48,-131.36)  405.07                80
 09/12/2017   10:33:43   (   0.32,-134.91) (   0.68,-136.63)  195.57                80